Here's a simple poster illustrating our stages of sleep:
Stage 1: State of resting by closing our eyes. Our brain activity slows down, our body relaxed, but we're still conscious of our environment.
Stage 2: When awoken by others in this stage, we might not even know we've fallen asleep!
Stage 3 & 4: They are often combined and is also known as Slow Wave Sleep (SWS), a name that derives from our brain activity. Also, this is the stage where our homeostatic pressure (the intensity and need for sleep) is recovered back to "baseline".
Note: The longer we go without sleep, the higher our homeostatic pressure will be! This process in different from our body's circadian system, but rather they both complement each other.
"Stage 5" Rapid Eye Movement (REM) Sleep : Here, we are most likely to enter dreamworld and even able to recall what the dream was about. Researchers have been trying to find out what is the purpose of dreams and the purpose of REM sleep, and found out that REM sleep is especially critical for memory consolidation, controlling emotions as well as developing creativity.
P.S. The lady in this diagram is being hooked up to what we call a Polysomnogram (PSG), which is a diagnostic tool used in the study of sleep to measure sleep progression. The PSG has three main components - the EEG to measure the brain, EOG for our eye movements and EMG for muscle movements.
Really sleepy now, gonna head to bed now!
Stage 1: State of resting by closing our eyes. Our brain activity slows down, our body relaxed, but we're still conscious of our environment.
Stage 2: When awoken by others in this stage, we might not even know we've fallen asleep!
Stage 3 & 4: They are often combined and is also known as Slow Wave Sleep (SWS), a name that derives from our brain activity. Also, this is the stage where our homeostatic pressure (the intensity and need for sleep) is recovered back to "baseline".
Note: The longer we go without sleep, the higher our homeostatic pressure will be! This process in different from our body's circadian system, but rather they both complement each other.
"Stage 5" Rapid Eye Movement (REM) Sleep : Here, we are most likely to enter dreamworld and even able to recall what the dream was about. Researchers have been trying to find out what is the purpose of dreams and the purpose of REM sleep, and found out that REM sleep is especially critical for memory consolidation, controlling emotions as well as developing creativity.
P.S. The lady in this diagram is being hooked up to what we call a Polysomnogram (PSG), which is a diagnostic tool used in the study of sleep to measure sleep progression. The PSG has three main components - the EEG to measure the brain, EOG for our eye movements and EMG for muscle movements.
Really sleepy now, gonna head to bed now!
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